Patent DE-19947894-C1 (DE)
Title: Appts to eddy and interlace texturized multifilament yarns has a structured yarn channel in sections in relation to the blower channel to give a stable bond unaffected during weaving/knitting
Inventor: JANSEN PETER-BERNHARD
IPC: D02J1/08
Filed: 1999-10-06
Granted: 2001-03-29
Abstract: The appts. to eddy multifilament yarns together, to give interlaced yarns, has a yarn channel (3) with at least one blower channel (5',5) opening into it connected to a compressed air feed. The cross section of each blower channel (5',5) expands towards the yarn channel (3). The yarn channel (3) is divided into sections in relation to the opening of the blower channel (5',5), with one section (3') in front of it, one section (3) at the channel opening and one section (3') after it. The second section (3) of the yarn channel (3) has a larger cross section surface at right angles to the yarn channel axis than that of the flanking channels (3',3').  The center section (3) of the yarn channel (3) has a width and a length which increase at least in sections from the opening of the blower channel (5',5) towards the opposite wall of the channel. The length and width of the center section (3) of the yarn channel (3) expand at right angles to the channel axis and concentric to the opening of the blower channel (5',5), away from the blower channel opening. The contour of the yarn channel center section (3) has a U-shape at least across its width, in the shape of a ball cap interrupted by the opening of the blower channel (5',5). The largest width of the yarn channel center section (3) is 1.5-3.0 times the average width of the flanking channel sections (3',3'). The wall of the yarn channel (3) at the center section (3) is flat, opposite the opening of the blower channel (5',5), and the blower channel (5',5) axis is at right angles to the opposite wall. The axis of the blower channel forms an angle of 90-30 deg  with the axis of the yarn channel (3). The blower channel initially has a reduced cross section, towards the yarn channel (3), followed by an enlarged cross section in the shape of a truncated cone after the narrowest point of the channel. The blower channel (5',5) has the structure of a Laval jet as a convergent-divergent nozzle for a supersonic flow. The opening of the blower channel (5',5) into the yarn channel (3) has a cross section with a surface which is 1.2-3.0 times the surface of the blower channel at its narrowest point. The leading section (3') of the yarn channel (3) has a constant increase in its cross section, which transits into the trailing section (3'), so that the average cross section of the first section is smaller than that of the third section. The third yarn channel section is located in relation to the preceding blower channel of the first section and a following blower channel. The first and third yarn channel sections (3',3') have the same length, as a groove with flat walls, and the opening of the blower channel (5',5) in the center section (3) is at the plane of the base of the groove of the flanking channels. The yarn eddy assembly is in two parts. The first part (1) has the blower channel (5',5) and the groove, and the second part (2) is a flat plate which covers the groove of the first section. The yarn channel (3) can be opened and closed by twisting or sliding the two parts (1,2) of the assembly, to insert and remove the multifilament yarns when open and to eddy them together when closed. In another form, the multifilament yarns can be inserted into the assembly through a side slit.